Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a894f38a0cd89b3…

MALICIOUS

PDF

87.6 KB Created: 2021-03-02 20:29:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6809b5a2d646737ed02de588e05759e3 SHA-1: f0facac22504f9fd954e0f7013177587d177d962 SHA-256: 3a894f38a0cd89b3d5b38509fc37a06e705ac423a61d562edcc26b9a6a19744a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains an embedded URI pointing to a suspicious domain, identified by both heuristics and a machine learning classifier as malicious. ClamAV also detected it as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of the external URI strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/wix?keyword=target+dress+code+reddit PDF link annotation
    • https://cdn.sqhk.co/dutudovajud/yhbWQgd/85533236616.pdfIn PDF document text
    • https://cdn.sqhk.co/debefuki/tjgsIFM/99028171884.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/ca_paid_leave_of_absence.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/heid1gq/my_pc_specs_test.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/delta_band_saw_parts_28-203.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413118/normal_600969fc7dc1f.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/haXNjch/nuclear_bomb_explosion_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopovis.myartsonline.com/71336172988.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/noxasawaz.pdfIn PDF document text
    • http://dufojamimusim.atwebpages.com/pride_and_prejudice_movie_free_download_mp4.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 5024 bytes
SHA-256: 0a9b51c59bdbaca735a364c9f914de7ad4c8878ca2ad4eaabf0265dbd4130364
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 11020 bytes
SHA-256: f165db2c75f74d80e939773c4ef2c364ddc34e2ec6f530f491ddc0d5b7a726fb
font_02_sfnt_off00013ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE2 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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